Valve grinder



Patented Bee. Z8, 19263.

iin/iran stares EARL F. MONDI-ION, OESANTA MONCA, CALFORNIA.

VALVE GBINDER.

Application filed August 21, 1924. Serial No. 733,372.

rlhis invention relates in general to a device particularly adapted to grind the poppet valves of internal combustion motors, and the main object is to provide a valve grinding device capable of being manually operated for oscillating the valve in opposite directions, at regularly timed intervals through the medium of a reciprocable operating member.

More particularly the object is to provide a device embodying an oscillatable stem, or spindle, upon which is mounted a manually reciprocable operating member arranged to rotate the stem in a given direction when the operating member is moved in one direction, and to rotate said stem in an opposite direction when the operat-ing memberis moved in the other direction.

A further object is to provide means whereby after each return stroke of the operating member the succeeding stroke thereof will effect the reversal of the mechanism for continuing the rotation of the stem in the same direction as on the preceding stroke.

A further Object, is to providev a fly wheel on the stem of the device whereby the momentum set up in a given stroke kof the operating member may be utilized for. effecting the reversal" of the mechanism for the purpose stated.

A still further object is to provide means on the stem andv adapted for resilient yengagement with the operating member for cushioning the operation of the operating member on the down-stroke and for urging the same upwardly at. the beginning of the upsrolre, thus insuring the reversal ofthe device at the completion of each cycle of' operation.

Other objects may appear as the description progresses. I have shown one practical embodiment. of my invention in the accompanying drawing, in which:

Fig. 1 is an external view of the assem-y bled device;

Fig. 2 is a longitudinal section of the same;

Fig. 3 is a transverse section of the sameon line 3 3 of Fig. 2;

l and 5 are enlarged diagrammatic views showing-the peripheral grooves onth'e stem of the device with the dogs engaging the grooves at different positions;

Fig. 6 is a perspective view of/one ofthek operating dogs;

Fig. 7 is a face view of a'tool such-as is adaptedto be attached to the stem of the device for connection with a valve to be ground by means of my device;

Figs. 8 and 9, are top plan views ofdif'- ferent types of poppet valve heads to which the tool shown in Fig', 7 may be attachedforw oscillatingV the valves in a grinding operation.

My device includes as primary elements thereof a substantially elongated stem S hav-y ing a handle H on the upper end thereof, a fly wheel lV on the lowerend thereof, ay hand grip yGr slidably andv rotatably held onv the intermediate portion thereof,y and a-suitable tool T detachablyheld on the lower end adjacent the ily wheel W7 for engagement with a valve V, as shown in Fig. 2.

Stem S has two pairs of reversely formed helical grooves g, g, and g, gl on the periphery thereof which are slightly wider at their tops than at their bottoms. Said'- pairs of grooves intersect at point 17, 17, etc., and are generally formed inv a manner somewhat similar to the well known types of screw drivers in which suchgrooves are employed. The lead of the two pairs of grooves is the same and the number of turns around the stem S may be changed'from the showing of the drawings, as may be found necessary in the operation lof a valve grinder. Said grooves are open at the upper end of stem S and at the lower end thereof one of thev grooves g and one of the grooves g intersect andare continued in a longitudinal groove portion 18 on one side of the stem Sy while the other groove g and the other groove (/intersect andcontinue in a straight longitudinal groove 18 on the diametrically opposite side of stem S.

Hand grip Gr Vmay be formed of wood or composition material as desired and provided with a metallic sleeve G extending throughout the entire length thereof 'and held-in grip G by means of one -or more set. screws 30. A pair of dogs D, D, are can. ried in the sleeve G" for engagement with the grooves g, g, and g', g', for the purpose of rotating the stem S when the grip G is moved longitudinally/of thev stem S. Said dogs have stems 19 which are loosely held in apertures 2O in the slee-ve Gr and right angularly formed portionsQl and 21 which correspond in cross section to the form of the grooves g, g, and g', g.

lilil The device is adapted to be held in a vertical position when in use so that the portions 21 of the dogs D, will point downwardly while the portions 21 thereof will be directed upwardly. llhe portions 21 of said dogs are preferably pointed at the ends thereof, as shown in Fig'. 6, and the length ot the dogs from the lower ends ot portions 21 to the upper ends of portions 21 is slightly greater than the openings 17 at the intersections otl the grooves g, g, and g, g. rllhus during the movement ot the grip G on stein S the dogs will span the intersections 17 and guide the grip G' in its movement.

At the lowermost points of intersections of grooves g and g as at 18 the grooves are widened so as to permit the turning ot the portions 21 of said dogs to permit the reversal of the device as hereinafter described.

Stein S has a reduced lower end portion S with a bore 'formed therein for receiving the stein l ot a suitable tool T and the l'ly .rheel lV is carried on the portion S and may be held by means ot a set screw 2 which is threaded into the hub 25 et said wheel and also has a reduced inner portion 2 extending through the portion S and into the stem 4 ot the tool T. rllhus the same set screw 2 which holds the fly wheel on the stem S may be employed for holding the tool stein in position on the device.

Tool T may be ot any suitable form but usually it partakes ot one ot the forms shown in Figs. 1, 2 and 7 and constitutes a fiat member with a blade 1G as shown in Figs. 1 and 2, or a pair ot prongs 12, 12 as shown in Fig. Z7. T he upper portion 12 ot the tool maybe held in a slot in the end olI the stem e by means oil a pin 1f so that it may be quickly removed and attached to the stem.'

The poppet valves V which are adapted to be ground in their seats by means ot my device are ot the form shown in Figs. 2, 8 and 9 and are'adapted to engage the beveled seats 10 in a cylinder C. Said valves may have a pair' ot holes 11, 11 on the heads thereof for receiving the prongs 12, 12 of the tool T, er they may have a single diametrically formed groove 13 for receiving the 'fiat blade 16 of said tool.

rlhe inner' end ol hub 25 of the fly wheel il] is turned to slidably receive a metallic sleeve 26, and is also counterbored at 24rto receive the lower end oi a spring A which encompasses the portion S ot the stem S. The upper end ot spring A bears against a leather washer 2i' which abuts the end web 26 of sleeve 26 and said spring serves to urge the sleeve 26 upwardly. Grip G has a connterbore in. the lower end thereof which carries a leather washer 28 and into which the upper end oi sleeve 26 is adapted to project when the grip reaches its lowermost limit ot movement. The two washers 27 and 28 serve to cushion the impact between the metallic portions of the device at the lowermost limit ot' each stroke and the engagement et the grip G 'ith the sleeve 2G coinpresses the spring A and cushions the grip in its n'iovement.

Handle H at the upper end ot the device carries a bushing L whicii loosely the duced upper end S of s; bearing tor the handle on said stein. Handle H is rotatably held on stein S, by means of a screw 1 which extends through retaining washer 7) on the upper end of the handle and is secured to the end portieri S ot the stem S, as shown in Fig.

Thus, when the device is positioned for use with the stem bi in a substantially vertical position, the tool T, may be loosely connected with the valve Tv7 in the manner hereinbeiore described, and pressure exerted on the handle H, a, tl e top oi" the sten: S to hold the device in operative con.- nection with said valve.

Now, in operation, the grip G is movd upwardly and downwardly on stem by grasping the same with the hands in auch a manner that the rotation oi" said grip may be prevented, and the reciprocal movement oic said grip will etiect the rotation ot the stem S, due to the connection therebetween by means of the pair ot dogs D, D, as hereinbe'liore described.

Assuming that the grip is positioned at its lowermost limit of movement at the beginning ot a valve grinding operation, the dogs D, D, will engage the straight portions 18, 18 ot one pair of the grooves, either g, g, or g, g', as the ease may be. On the following up-strolre of the grip G the dogs D, D, will slide upwardly in the selec-ted pair ot grooves and on the succeeding down-stroke thereotl said dogs will move downwardly in the same grooves. rlhus on the up-stroke of the grip the stem S will be rotated in one direction and on the following down-stroke thereof said grip will rotate said stem in a reverse direction.

When the grip G engages the sleeve 26, however, the spring A is compressed and tends to urge the grip upwardly, and the momentum set up by the rotation of the stem and fly wheel N tends to swing the dogs D, D, in a direction corresponding to the previous direction of movement of the stem S. Before the effect of the Vmomentum is nullitied, the action ot spring A. will etect a sufficient upward movement of grip G so as to direct the 'dogs D, D, into the other set of grooves g, g, or g, g, and the succeeding upward movement will rotate the stem S in the same direction as was effected by the next previous downward movement of the grip. In other words at the completion of each cycle ot movementv the next ies move-ment of the grip will continue the rotation of the stem S in the same direction it was previously moved.

The purpose of this continuation of movement in a given direction is to provide ample movement in one direction without enlarging the device beyond dimensions which will be convenient to the operator. Inl order to provide a practicable device the. grooves g, g, and g, g', should be formed with a long lead around the stem S, at least one and one half turns, which will provide means for rotating the stem S for a corresponding number of revolutions on each half stroke of th-e grip G. Thus at each stroke of the device the stem is rotated one and one half revolutions, by means of the reversing mechanism shown and described, the valve V would be rotated three complete revolutions before the reversal thereof.

rllhe device is best operated by gripping the member G with one hand loosely and by manually moving the same upwardly and downwardly on the stem S with an easy movement and without effort so that the spring A at the bottom of the stroke may become effecive for reversing the dogs D, D, due to the momentum of the wheel WV.

As in other devices the grinding compound is placed on the beveled surface of the valve V and on the seat 10 and the continued operation of the tool T serves to thorough y grind the valve in its seat. Valve V may be urged upwardly by slight spring tension so that the weight vof the grinder will be sufficient to seat the valve in the grinding operation.

rIhe junction points 18', 18 of the grooves g, and g and the portions 18 are of substantially greater area than the grooves proper so as to provide ample space in which to effect the reversal of the 'dogs D, D, when the saine are at their lowermost limits of movement. It will be understood in this connection that said dogs may only be reversed at their lowermost limits of movement, and that the reversal of direction of rotation of stem S is accomplished by the returnof the dogs in the same grooves which they traversed on the upward stroke of grip G. rlhe change from one pair-of grooves to the other does not reverse the direction of rotation but on the other hand continues the rotation in the same direction that the stem was rotated on the next previous'down stroke of grip G.

I am well aware that other devices have heretofore been made and used embodying a pair, or pairs of reversely formed grooves on a stem of the character shown, but I am not aware that the particular arrangement for reversing the dogs in the grooves and for joining the grooves as shown, has ever been used or known.

I conceive it to be possible to modify my invention within the scope of the appended, claims without departing from the spiritV thereof.

What I claim is :v

l. A tool of the character described comprising a shaft having a pair of reversely formed spiral grooves on the periphery thereof, said grooves terminating near one end of saidkshaftat diametrically opposite points, and provided with longitudinal extensions, the sides of the grooves connecting the spiral and longitudinal portions thereof being formed so as to gradually widen the grooves in the direction of the spiral portions, and an operating member slidable on said shaft and having dogs pivotally held therein with elongated portions engaging said grooves, as described.

2. A tool of the character described coinprising a shaft having a pair of reversely formed spiral grooves on the periphery thereof, said grooves terminating near one end of said shaft at diametrically opposite points, and provided with longitudinal eX- tensions, the sides of the grooves connecting the spiral and longitudinal portions thereof being formed so as to gradually widen the grooves in the direction of the spiral portions, an operating member slidable on said shaft and having dogs pivotally held therein with elongated portions engaging said grooves, and means supported on said shaft and cooperating with said operating member whereby at the end of a stroke of said operating member said dogs will be moved pivotally as they enter the longitudinal portions of said grooves for changing the dogs from one of said grooves into the other for a reverse operation.

3. A tool of the character described comprising a shaft having a pair of reversely formed spiral grooves on the periphery thereof, said grooves terminating near one end of said shaft at diametrically opposite points, and provided with longitudinal eX- tensions, the sides of the grooves connecting the spiral and longitudinal portions thereof being forinedso as to gradually widen the grooves in the direction of the spiral portions, an operating member slidable on said shaft and having dogs pivotally held therein with elongated portions engaging said grooves, a balance wheel fixed to said shaft for causing said dogs at the end of a stroke of said operating member to disengage one of the sides of the associated grooves, and to engage the othersides of said grooves for continuing the rotation of the shaft, in the same direction on the ensuing 11p-stroke of said handle.

4. A tool of the character described comprising a shaft having a pair of reversely formed spiral grooves on the periphery thereof, said grooves terminating near one end of said shaft at diametrically opposite points, and provided With longitudinal eX- tensions, the sides of the grooves connecting the spiral and longitudinal portions thereotl being formed so as to gradually Widen the grooves in the direction of the spiral portions, an operating member slidable on said shaft and having dogs pivotally held therein with elongated portions engaging said grooves, a balance Wheel fixed to Said shaft l for cansino' said dogs at the end of a stroke of said operating member to disengage one of the sides of the associated grooves, and to engage the other sides of said grooves for continuing the rotation of the shaft in the sume direction on the ensuing up-strole of said handle, and means interposed between said balance Wheel and said operating member for cushioning the movement of said operating member.

EARL F. MONOHON. 

